Hmm, that seems a bit pricey, when you can spend 5 pts to get a +1 that applies in all circumstances, with no 1 out of 6 significant drawback.
The way its written, I don't think I would field a model with this special ability.
Andrea Sfiligoi wrote:Disarming Block: the idea was actually not a shield but a sai or left hand dagger used to disarm, or a buckler used to punch away the opponent's weapon. I might just remove the "needs a shield" part of the rule.